Make TriggerEventController accept both 'channel' and 'channels'. (#1046)

Author: madpilot78

src/HttpApi/Controllers/TriggerEventController.php

@@ -11,8 +11,19 @@ class TriggerEventController extends Controller
     public function __invoke(Request $request)
     {
         $this->ensureValidSignature($request);
+        $payload = $request->json();
 
-        foreach ($request->json()->get('channels', []) as $channelName) {
+        if ($payload->has('channel')) {
+            $channels = [$payload->get('channel')];
+        } else {
+            $channels = $payload->get('channels', []);
+
+            if (is_string($channels)) {
+                $channels = [$channels];
+            }
+        }
+
+        foreach ($channels as $channelName) {
             $channel = $this->channelManager->find($request->appId, $channelName);
 
             optional($channel)->broadcastToEveryoneExcept([